Dialogues and dialectics have come to playan important role in the field of ArtificialIntelligence and Law. This paper describes thelegal-theoretical and logical background of this role,and discusses the different services into whichdialogues are put. These services include:characterising logical operators, modelling thedefeasibility of legal reasoning, providing the basisfor legal justification and identifying legal issues,and establishing the law in concrete cases. Specialattention is given to the requirements oflaw-establishing dialogues.

Douglas Walton’s multitudinous contributions to the study of argumentation seldom, if ever, directly engage with argumentation in mathematics. Nonetheless, several of the innovations with which he is most closely associated lend themselves to improving our understanding of mathematical arguments. I concentrate on two such innovations: dialogue types (§1) and argumentation schemes (§2). I argue that both devices are much more applicable to mathematical reasoning than may be commonly supposed.

A contrario reasoning (or ‘a contrario argument’ or ‘argument a contrario’) is traditionally understood as an appeal to the deliberate silence of the legislator: because a legal rule does not mention case X specifically, the rule is not applicable to it. Modern perspectives on legal reasoning often apply this label to a broader concept of reasoning, namely the reasoning by which a legal rule is not applied because of the differences between the case at hand and the one(s) mentioned in (...) the legal rule. This article first explains how the broader concept could have come into being, and then argues that from an argumentation theoretical point of view the modern concept makes no sense as a category of argumentation. Furthermore it is shown under which conditions the traditional concept can be sound. (shrink)

The author outlines a conceptually oriented rational reconstruction of crisis tendencies in modern law. The connection between problems of legitimacy and the notion of rationality is emphasized and topics involving both the theory of communicative rationality and the theory of practical reasoning (especially in law) are discussed. The author concludes that a theory transcending the traditional approaches is needed. Otherwise, we shall not be able to face the questions of jurisprudence in the future, especially as regards an assessment of the (...) relations between law and morality, between law and society and finally between law, legitimacy and democracy. (shrink)

The author singles out various conceptions of rationality used in practical legal discourse: formal and substantive rationality, instrumental goal‐ and means‐rationality, communicative rationality. Practical rationality is expressed in decisions justified by epistemic and axiological premises according to the rules of justificatory reasoning. Five levels of analysis of this justification are identified. Rules, principles and evaluations are used as justifying arguments and their characteristics determine the dimensions of rationality of decision depending on the features of rules, various conceptions of principles, and (...) kinds of relativisation of evaluations. The dimensions of legal rationality depend mainly on three singled out conceptions of rationality, i.e., formal rationality dealing with the deep structure of justification, instrumentally oriented rationality as content of justifiability, and communicative rationality linked with the pragmatics of human interaction. Legitimacy, according to the presented analysis, appears as a subclass of external justification dealing with axiological premisses in terms of instrumental rationality and/or communicative rationality. (shrink)

The aim of the article is to develop precise epistemic rules for good public political arguments, by which political measures in the broad sense are justified. By means of a theory of deliberative democracy, it is substantiated that the justification of a political measure consists in showing argumentatively that this measure most promotes the common good or is morally optimal. It is then discussed which argumentation-theoretical approaches are suitable for providing epistemically sound rules for arguments for such theses and for (...) the associated premises, rules whose compliance implies the truth or acceptability of the thesis. Finally, on the basis of the most suitable approach, namely the epistemological one, such systems of rules for the required types of arguments are presented that fulfil the conditions mentioned. (shrink)

In this essay, I will engage with the controversy that has sprung up between the proponents of the sharp separation thesis and those of the entanglement thesis. What I will be defending is a variant of the entanglement thesis. By drawing on contemporary action theory and on epistemic conceptualism, I will argue that, while objective facts and practical norms are indeed distinct categories of thought, that distinction does not amount to a conceptual gap—a dichotomy or unbridgeable divide. Their relation, in (...) other words, is not one of logical dualism but one of mere (analytical) distinction between interdependent categories of thinking. Hence the entanglement view on which distinction does not entail dichotomy. (shrink)

The article discusses topics in the context of contemporary legal argumentation. It starts with a sketch of the development of topics from ancient times until the present day. Here the author focuses on the theory of the German legal philosopher Theodor Viehweg, which was most influential to legal argumentation in the 20th century. Then a modern concept of topics is introduced and finally the author discusses the role of topics in contemporary legal argumentation. In this part the distinction between topoi (...) in the weak sense (practically all argumentation schemes) and in the strong sense (specific legal topoi as listed by Gerhard Struck in 1971 is introduced. The author argues that Viehweg’s claim that topics plays an important role in legal argumentation is problematic, because topoi in the weak sense are certainly of high importance, but this is almost trivial. Topoi in the strong sense on the other hand are only of minor importance for legal practice. What characterises legal discourse much more is a set specific pragmatic discourse rules, discussed at the end of the paper. (shrink)

Faced with the threat of pandemic influenza, several countries have made the decision to put a number of measures in place which have been incorporated into national plans. In view of the magnitude of the powers and responsibilities that States assume in the event of a pandemic, a review of the various national preparedness and response plans for pandemic influenza brought to light a series of extremely important ethical concerns. Nevertheless, in spite of the recent emergence of literature focusing specifically (...) on the ethical aspects of pandemics, too few studies explicitly examine public participation as one means of ethical contribution to public health policies. Thus this article seeks, in the first place, to present an analysis of the various national preparedness and response plans for pandemic influenza, and secondly, to outline the role that the plans envisage for ethics and more importantly for public participation. (shrink)

In this article, we try to trace the relationship between semiotics and theory of legal reasoning using Peirce’s idea that all reasoning must be necessarily in signs: every act of reasoning/argumentation is a sign process, leading to “the growth of knowledge. The broad scope and universal character of Peirce’s sign theory of reasoning allows us to look for new conciliatory paradigms, which must be presented in terms of possible synthesis between the traditional approaches to argumentation. These traditional approaches are strongly (...) affected by either the dialectical (logical) perspective or the rhetorical perspective on argumentation, while Peirce’s approach tends to reconcile the rhetorical and methodological aspects of reasoning. This reconcilation is best illustrated by Peircean analysis of argument’s logical and rhetorical structure; while the diagrammatic (iconic) analysis of arguments is performed in the system of Existential Graphs (which is Peirce’s major methodological system, designed for the expressions of propositions in point of their relational structure). Obviously, Peirce’s original division of argument parts offered only the characterisation of the sign activity (involved in the process of reasoning), and thus left much to be desired in terms of practical explication. (shrink)

In this paper I investigate the similarities betweenthe dialectical procedure in the pragma-dialecticaltheory and dialectical procedures in AI and Law. I dothis by focusing on one specific type of reasoning inlaw: analogy argumentation. I will argue that analogyargumentation is not only a heuristic forfinding new premises, but also a part of thejustification of legal decisions. The relevantcriteria for the evaluation of analogy argumentationare not to be found at the logical level of inference,but at the procedural level of the discussion. I (...) willproceed as follows. I start with an outline ofPrakken's theory of argumentation frameworks andprocedural models. Then, I will discuss Peczenik'sanalysis of analogy argumentation and try to combineit with the descriptive-normative research ofMacCormick and Summers. Finally, I propose asystematization of the criteria for the evaluation ofanalogy argumentation within the framework of apragma-dialectical notion of an argumentation scheme. (shrink)

The author introduces a normative conception of coherence, derived from a pragmatic interpretation of the application of norms to concrete cases. A distinction is made between the justification of a norm and its application. In the case of moral norms, justification and application can be analysed as two different discursive procedures which give rise to different aspects of the principle of impartiality. Impartial justification requires a procedure by which all interests concerned are taken into account whereas impartial application requires a (...) procedure where all features of a situation are considered. The complete description of a concrete case makes necessary a coherent interpretation of all the valid norms which are prima facie applicable. This requirement of an ideal coherent system of norms is restricted to interpretive “paradigms” in the case of legal norms, because it is necessary to produce singular judgments under the restrictive conditions of scarce time and incomplete knowledge. (shrink)

Argumentation as the public exchange of reasons is widely thought to enhance deliberative interactions that generate and justify reasonable public policies. Adopting an argumentation-theoretic perspective, we survey the norms that should govern public argumentation and address some of the complexities that scholarly treatments have identified. Our focus is on norms associated with the ideals of correctness and participation as sources of a politically legitimate deliberative outcome. In principle, both ideals are mutually coherent. If the information needed for a correct deliberative (...) outcome is distributed among agents, then maximising participation increases information diversity. But both ideals can also be in tension. If participants lack competence or are prone to biases, a correct deliberative outcome requires limiting participation. The central question for public argumentation, therefore, is how to strike a balance between both ideals. Rather than advocating a preferred normative framework, our main purpose is to illustrate the complexity of this theme. (shrink)

Philosophy & Social Criticism, Volume 48, Issue 7, Page 937-955, September 2022. Reasonableness is a complex notion recently developed by legal and political theorists. John Rawls’s famous proposal of ‘reasonableness as reciprocity’ requires careful testing in the light of several criteria arising from legal doctrine and adjudication. I enquire into this variety of concepts in search of a common thread that makes sense of the use of the same concept in diverse contexts. I assume the normative thrust of reasonableness as (...) an institutional and an individual virtue the basic core of which derives from Aristotelian phronesis. However, this double aspect of reasonableness betrays its major complexity that I try to shape through the help of two categories: subjective agency and objective context. The upshot of my enquiry will be that of showing that we can use another model, alternative to Rawls’s and better able to make sense of the variety of legal and ethical uses: Von Wright’s reasonableness as ‘the right way of living’. (shrink)

Many ethical issues facing managers of multinational corporations are polycentric problems. That is, they involve a number of distinct centers -- each of which define rights and obligations of a multiplicity of affected parties -- and resolving matters around one center typically creates unpredictable repercussions around one or more of the other centers. Polycentricity is a normative phenomenon especially unsuited for adjudication, often requiring recourse to alternative processes of contract (or reciprocal adjustment) and managerial direction. This study explores how such (...) concerns about the limits of adjudication (and its various moral counterparts) apply to international decisionmaking connected to human rights obligations of multinational companies. The focus is on ethical problems such as controlling child labor in LDCs such as Bangladesh, India and Pakistan; setting wages in developing countries like Honduras; and conducting business transactions with rights-violating regimes, such as the governments of Nigeria and Myanmar. (shrink)

The theory of rhetoric is recognised and widely used in a number of disciplines, particularly in the social sciences. It is therefore slightly surprising that it has not gained an important footing in jurisprudence. It is often argued that rhetoric and argumentative justification are clearly different issues. However, the present paper argues that they are in fact two aspects of argumentation and that the theory of rhetoric may be used also in the context of legal reasoning.

In this contribution two approaches of legal analogy-argumentation will be discussed: the traditional, monological approach and the dialogical approach. This contribution aims at answering the question in how far these approaches may serve as adequate instruments for rational reconstructions of this analogy-argumentation. We will also indicate along which lines the insights resulting from these approaches may be developed further in order to arrive at a more comprehensive and systematic method for a rational reconstruction of argumentation of this sort. We will (...) make use of the insights gained from the pragma-dialectical argumentation theory. (shrink)

In practical reasoning, reasonableness ‐ as opposed to rationality ‐ is an important concept. This paper explores the notion of reasonableness as applied exclusively to legal decisions. Conflicting values or legal requirements can make rationally deduced solutions unattainable, and may call for criteria of reasonableness, Conflicting values must be weighed, and weighed against each other, in search of a point of equilibrium between them. Legal cases are more or less difficult to solve, depending on the difficulty of finding a unique (...) optimal equilibrium. The relevance of factual and ideal consensus for the determination of a reasonable legal decision is underlined. Finally, a definition of “reasonable legal decision” is proposed. (shrink)

The author discusses a question related to a certain aspect of justification of legal decisions, often so-called internal justification-a legal decision is internally justified if and only if it can be deduced from the norm(s) applicable to the case, and from the statement(s) describing the facts of the case. According to this notion, infinite irrelevant logical consequences are justified. To avoid this counterintuitive conclusion, the author analyzes three notions of relevance: Sperber-Wilson's notion, Anderson-Belnap's notion, and Schurz's notion. The author presents (...) a reconstruction of the notion of relevance very close to Schurz's notion, extended to make it suitable to the particular characteristics of deontic logic. Finally, this notion of relevance is used to discuss some aspects of the concept of normative system, conceived as a deductive system, that is, a system containing all its logical consequences. (shrink)

Rationality and reasonableness can be illustrated as Janus-faced concepts, not only in a descriptive diagnosis but also in a normative construction of adjudication, and in the analysis of its practical and rhetorical effects. Considering such an illustration, the present reflection returns to the discussion on the relevance of rationality and reasonableness in legal interpretation, aiming at distinguishing and/or connecting principles and criteria, beyond formally logical and/or procedurally argumentative decision-making, and, thus, within a normatively practical adjudication. Such an approach will be (...) presented in two main steps. In a first step, the rationality/reasonableness dichotomy will be discussed within a constitutive connection between principles and criteria in adjudication, and understanding legal principles as normatively substantial foundations to legal criteria—the former as axiological references filtered into the juridical system and the latter as their concretizations, and whose practical adequacy is rhetorically assigned by the interpretive communities involved in/by adjudication, and normatively referred both to their practical accordance to the axiological normativity of the principles they shall presuppose and to their suitability as practical operators to the problematic relevance of the sub judice cases. In a second step, and consequently, encompassing the projection of legal interpretation, in semiotic and in practical-normative perspectives, in order to discuss their constituting practical relevance in adjudication, the rationality/reasonableness dichotomy will be experimented within formal-logical procedures and within practical-dialectical connections between juridical problem and juridical system—therefore stating a discussion on the foundations, the intentionality and the consequences of adjudication, amongst deduction and analogy. (shrink)

Although the genetic argument is a widely used interpretative argument, what it amounts to does not seem to be altogether clear. Basic forms of the genetic argument that are distinguished are often too rough to provide an adequate basis for the evaluation of an interpretative decision. In this article I attempt to provide a more detailed analysis of the genetic argument by making use of pragma-dialectical insights. The analysis clarifies the character and the structure of different forms of the genetic (...) argument and thus the elements that are relevant for the evaluation of the argument.*. (shrink)

This essay discusses the developments and trends of research in legalargumentation of the last 25 years. The essay starts with a survey of thevarious approaches which can be distinguished: the logical approach, therhetorical approach, and the dialogical approach. Then it identifies varioustopics in the research, which constitute the various components of aresearch programme of legal argumentation: the philosophical component, thetheoretical component, the reconstruction component, the empiricalcomponent, and the practical component. It concludes with a discussion ofthe main trends in the research (...) of the last 25 years. (shrink)